bug(#208): incorrect-package accepts fqn

[h1alexbel]

In this pull I've updated incorrect-package lint to support FQN names.
see #208

[h1alexbel]

waiting for #213

[h1alexbel]

@volodya-lombrozo could you check this one, please?

[yegor256]

@h1alexbel this is full regexp for FQN in EO: https://github.com/objectionary/eo/blob/master/eo-parser/src/main/resources/XMIR.xsd#L99 Maybe it's better to fix our matcher once and for all, not only for the $ sign. For example, this is a legit code:

+package a.b-привет.c-大家好

Will our current lint pass it?

[volodya-lombrozo]

@h1alexbel Despite having lowercase letters and _, $ signs, Java package might contain uppercase letters:

The specification allows it [uppercase characters] just fine. It's only a convention to use all-lower-case.

From: https://stackoverflow.com/a/12534341/10423604

[h1alexbel]

@volodya-lombrozo updated. Take a look, please

[volodya-lombrozo]

@h1alexbel Looks good to me, thank you!

[h1alexbel]

@yegor256 take a look, please

[yegor256]

@h1alexbel thanks!